Display device having backlight and control method thereof

Patent metadata

Field	Value
Publication number	US-10923048-B2
Application number	US-201916702018-A
Country	US
Kind code	B2
Filing date	Dec 3, 2019
Priority date	Jan 17, 2019
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

In a display device including a display panel having two areas and a backlight having two light-emitting sections, a first scanning period, a first blanking period, a second scanning period, and a second blanking period are set sequentially in one frame period, scanning lines in a first area are selected sequentially in the first scanning period, the scanning lines in a second area are selected sequentially in the second scanning period, a second light-emitting section is made to turn on in a first turn-on period set in the first blanking period, and a first light-emitting section is made to turn on in a second turn-on period set in the second blanking period.

First claim

What is claimed is:

1. A display device comprising:
a display panel including a plurality of scanning lines, a plurality of data lines, and a plurality of pixel circuits, and having a first area and a second area aligned in a same direction as the scanning lines;
a backlight having a first light-emitting section corresponding to the first area and a second light-emitting section corresponding to the second area;
a scanning line drive circuit configured to drive the scanning lines;
a data line drive circuit configured to drive the data lines; and
a backlight drive circuit configured to drive the backlight, wherein
a first scanning period, a first blanking period, a second scanning period, and a second blanking period are set sequentially in one frame period,
the scanning line drive circuit is configured to select the scanning lines in the first area sequentially in the first scanning period, and to select the scanning lines in the second area sequentially in the second scanning period, and
the backlight drive circuit is configured to make the second light-emitting section turn on in a first turn-on period set in the first blanking period, and to make the first light-emitting section turn on in a second turn-on period set in the second blanking period.

2. The display device according to claim 1 , wherein a response of the pixel circuit in the first area finishes before the first light-emitting section turns on, and the response of the pixel circuit in the second area finishes before the second light-emitting section turns on.

3. The display device according to claim 1 , wherein
the backlight has an edge type configuration including a light guide plate having a portion included in the first light-emitting section and a portion included in the second light-emitting section, a plurality of first light-emitting elements included in the first light-emitting section, and a plurality of second light-emitting elements included in the second light-emitting section, and
the backlight drive circuit is configured to make the second light-emitting elements turn on in the first turn-on period, and to make the first light-emitting elements turn on in the second turn-on period.

4. The display device according to claim 1 , wherein
the first light-emitting section has an edge type configuration including a first light guide plate and a plurality of first light-emitting elements,
the second light-emitting section has an edge type configuration including a second light guide plate and a plurality of second light-emitting elements, independently of the first light-emitting section, and
the backlight drive circuit is configured to make the second light-emitting elements turn on in the first turn-on period, and to make the first light-emitting elements turn on in the second turn-on period.

5. The display device according to claim 1 , wherein
the backlight has a direct type configuration including a diffusion plate having a portion included in the first light-emitting section and a portion included in the second light-emitting section, and a plurality of light-emitting elements having a portion included in the first light-emitting section and a remainder included in the second light-emitting section, and
the backlight drive circuit is configured to make the light-emitting elements included in the second light-emitting section turn on in the first turn-on period, and to make the light-emitting elements included in the first light-emitting section turn on in the second turn-on period.

6. The display device according to claim 1 , wherein the display panel is a liquid crystal panel.

7. The display device according to claim 1 , wherein the backlight includes a plurality of light emitting diodes.

8. A control method of a display device having a display panel including a plurality of scanning lines, a plurality of data lines, and a plurality of pixel circuits, and having a first area and a second area aligned in a same direction as the scanning lines, and a backlight including a first light-emitting section corresponding to the first area and a second light-emitting section corresponding to the second area, the method comprising steps of:
setting a first scanning period, a first blanking period, a second scanning period, and a second blanking period sequentially in one frame period;
selecting the scanning lines in the first area sequentially in the first scanning period, and selecting the scanning lines in the second area sequentially in the second scanning period;
driving the data lines, and
driving the backlight by making the second light-emitting section turn on in a first turn-on period set in the first blanking period, and making the first light-emitting section turn on in a second turn-on period set in the second blanking period.

9. The control method of the display device according to claim 8 , wherein a response of the pixel circuit in the first area finishes before the first light-emitting section turns on, and the response of the pixel circuit in the second area finishes before the second light-emitting section turns on.

10. The control method of the display device according to claim 8 , wherein
the backlight has an edge type configuration including a light guide plate having a portion included in the first light-emitting section and a portion included in the second light-emitting section, a plurality of first light-emitting elements included in the first light-emitting section, and a plurality of second light-emitting elements included in the second light-emitting section, and
in driving the backlight, the second light-emitting elements are made to turn on in the first turn-on period, and the first light-emitting elements are made to turn on in the second turn-on period.

11. The control method of the display device according to claim 8 , wherein
the first light-emitting section has an edge type configuration including a first light guide plate and a plurality of first light-emitting elements,
the second light-emitting section has an edge type configuration including a second light guide plate and a plurality of second light-emitting elements, independently of the first light-emitting section, and
in driving the backlight, the second light-emitting elements are made to turn on in the first turn-on period, and the first light-emitting elements are made to turn on in the second turn-on period.

12. The control method of the display device according to claim 8 , wherein
the backlight has a direct type configuration including a diffusion plate having a portion included in the first light-emitting section and a portion included in the second light-emitting section, and a plurality of light-emitting elements having a portion included in the first light-emitting section and a remainder included in the second light-emitting section, and
in driving the backlight, the light-emitting elements included in the second light-emitting section are made to turn on in the first turn-on period, and the light-emitting elements included in the first light-emitting section are made to turn on in the second turn-on period.

13. The control method of the display device according to claim 8 , wherein the display panel is a liquid crystal panel.

14. The control method of the display device according to claim 8 , wherein the backlight includes a plurality of light emitting diodes.

Assignees

• Sharp Kk

Inventors

• Handa Takuya
• Ohhara Kohichi
• Tohdoh Hideo

Classifications

• G02B6/0073

  Light emitting diode [LED] · CPC title

• G02B6/0051

  Diffusing sheet or layer · CPC title

• G02B6/0075 Primary

  Arrangements of multiple light guides (G02B6/0028 takes precedence) · CPC title

• G09G3/342 Primary

  using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines · CPC title

• G02B6/0078

  Side-by-side arrangements, e.g. for large area displays · CPC title